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Jameco Part Number 839586
LM384
5W Audio Power Amplifier
General Description
Features
The LM384 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, gain is
internally fixed at 34 dB. A unique input stage allows ground
referenced input signals. The output automatically selfcenters to one-half the supply voltage.
The output is short-circuit proof with internal thermal limiting.
The package outline is standard dual-in-line. A copper lead
frame is used with the center three pins on either side
comprising a heat sink. This makes the device easy to use in
standard p-c layout.
Wide supply voltage range: 12V to 26V
Low quiescent power drain
Voltage gain fixed at 50
High peak current capability: 1.3A
Input referenced to GND
High input impedance: 150kΩ
Low distortion: 0.25% (PO=4W, RL=8Ω)
Quiescent output voltage is at one half of the supply
voltage
n Standard dual-in-line package
Uses include simple phonograph amplifiers, intercoms, line
drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio, sound projector systems, etc. See AN-69 for circuit details.
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Schematic Diagram
00784303
© 2004 National Semiconductor Corporation
DS007843
www.national.com
LM384 5W Audio Power Amplifier
August 2000
LM384
Absolute Maximum Ratings (Note 1)
Operating Temperature
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Lead Temperature
(Soldering, 10 sec.)
0˚C to +70˚C
260˚C
Thermal Resistance
Supply Voltage
28V
θJC
30˚C/W
Peak Current
1.3A
θJA
79˚C/W
Power Dissipation (See (Notes 4, 5))
1.67W
Input Voltage
± 0.5V
Storage Temperature
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Operating Ratings indicate conditions for which the
device is functional, but do not guarantee specific performance limits.
−65˚C to +150˚C
Electrical Characteristics (Note 2)
Symbol
Parameter
ZIN
Input Resistance
IBIAS
Bias Current
AV
Gain
Conditions
Min
Typ
Max
150
Inputs Floating
kΩ
100
40
50
Units
nA
60
V/V
25
mA
POUT
Output Power
IQ
Quiescent Supply Current
VOUT Q
Quiescent Output Voltage
BW
Bandwidth
V+
Supply Voltage
ISC
Short Circuit Current (Note 6)
1.3
A
PSRRRTO
Power Supply Rejection Ratio
31
dB
THD = 10%, RL = 8Ω
5
5.5
8.5
POUT = 2W, RL = 8Ω
W
11
V
450
kHz
12
26
V
(Note 3) )
THD
Total Harmonic Distortion
POUT = 4W, RL = 8Ω
Note 2: V+ = 22V and TA = 25˚C operating with a Staver V7 heat sink for 30 seconds.
Note 3: Rejection ratio referred to the output with CBYPASS = 5 µF, freq = 120 Hz.
Note 4: The maximum junction temperature of the LM384 is 150˚C.
Note 5: The package is to be derated at 15˚C/W junction to heat sink pins.
Note 6: Output is fully protected against a shorted speaker condition at all voltages up to 22V.
Heat Sink Dimensions
Staver “V7” Heat Sink
00784304
Staver Company
41 Saxon Ave.
P.O. Drawer H
Bay Shore, N.Y.
Tel: (516) 666-8000
www.national.com
2
0.25
1.0
%
LM384
Typical Performance Characteristics
Device Dissipation vs
Ambient Temperature
Thermal Resistance vs
Square Inches
00784310
00784311
Supply Decoupling vs
Frequency
Total Harmonic Distortion
vs Output Power
00784312
00784313
Output Voltage Gain vs
Frequency
Total Harmonic Distortion
vs Frequency
00784315
00784314
3
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LM384
Typical Performance Characteristics
(Continued)
Power Supply Current vs
Supply Voltage
Device Dissipation vs
Output Power — 16Ω Load
00784316
00784317
Device Dissipation vs
Output Power — 8Ω Load
Device Dissipation vs
Output Power — 4Ω Load
00784319
00784318
Block and Connection Diagrams
Dual-In-Line Package
00784301
00784302
Note 7: Heatsink Pins
Top View Order Number LM384NSee NS Package
Number N14A
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4
LM384
Typical Applications
Typical 5W Amplifier
00784306
Bridge Amplifier
00784307
Intercom
00784308
*For stability with high current loads
5
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LM384
Typical Applications
(Continued)
Phase Shift Oscillator
00784309
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6
LM384 5W Audio Power Amplifier
Physical Dimensions
inches (millimeters) unless otherwise noted
Molded Dual-In-Line Package (N)
Order Number LM384N
NS Package Number N14A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.
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